Patent GB-329344-A (GB)
Title: Improvements in or relating to machines for bending and sawing metal goods
IPC: B21D7/06
Filed: 1929-02-16
Abstract: 329,344. Darlington Rolling Mills Co., Ltd., Mensforth, T., and Owston, J. E. Feb. 16, 1929. Rods and bars.-A machine for bending and sawing metal bars comprises a carriage traversed on runways fixed to concrete walls and carrying adjustable brackets on which are mounted levers provided with rollers for bending the bars round a former fixed on a bed plate on framework secured to the walls, together with means for sawing the bar after bending. The runways consist of girders 10, the webs of which are secured to one flange of girders 9 the other of which is secured to brackets 8, 8a fixed to the concrete walls. One or more recessed formers 6 each made in one or more sections are secured on bed plates 5 supported from the walls by longitudinal and transverse girders 3, 4. The carriage 11 has end portions 12 with rollers 13, 14 engaging the runways and is provided with adjustable brackets 15 each supporting a pivot 17 for levers 18, 23 respectively carrying a pulley 22 and a bending roller 26. The bar 44 is fixed to the former and bending performed by traversing the carriage by link ropes 28 secured thereto at one end 27 and passing over vertical pulleys 29, 32 and horizontal pulleys 35 carried by a compensating lever 36 and thence over drums 39 mounted on a shaft 40 driven by an electric motor preferably through a speed reducer. The bending rollers are pressed inward by wire ropes 45 anchored to the carriage at 46 and passing over pulleys 22, 47, 49, weighted pulleys 52, pulleys 57, 60 and on to drums 63 on the shaft 40. The ends 7 of the former are cam shaped so that the bar is pressed to the shape of the recess in the former. The carriage is returned by the cords 45 on reversing the drive of the motor. A circular saw 79 is carried by a framework 68 pivoted at 66 to brackets 65 mounted on a pillar on the concrete base 2 and raised bv an hydraulic ram 70, the frame being counterpoised to relieve the ram by the electric motor 75, which drives the saw through chain or belt gearing. In a modification the girders are supported on skeleton brackets secured to pedestal brackets on the walls. The bending rollers are carried on tapered spindles mounted on ball or roller bearings in a sleeve in a boss 90 of a bifurcated arm 88, 89 pivoted at 91 on the adjustable brackets. The brackets consist of plates 84, 85 and scale plates 86, 87 and are clamped in position by screws 94 engaging slippers 92 so as to press the parts against the carriage. The levers are normally pressed outwards by springs 126 against stops 97 and may be locked in position by pins passing through holes 98, 100 in the arms and brackets respectively. The carriage is traversed during bending by wire ropes 28 guided in a similar manner to the first form except that the pulleys 35 are mounted on fixed brackets. The shaft 40 is driven from the electric motor 42 through a speed reducer 43 and speed gear 116. The wire ropes 45 are also wound on the drums 39 and pass over pulleys 60 on doubleended levers 118, then over pulleys 120, 57, 49. 47 across the carriage and are fixed to projections 110 in the levers 88, 89. The levers 118 are linked to a piston rod 123 having at one end a piston in a constant pressure hydraulic cylinder 125 and at the other end a piston in a single acting cylinder 124. The brackets 65 in which the saw frame is mounted are carried by standards secured' to the pillar 64. The bars may be transferred to the machine on the live roller table 132 of a rolling mill.